Blowpipe.



J. HARRIS.

BLOWPIPB. APPLICATION FILED DEU. 17, 1908.

Patented Apr. 27, 1909.

' UNITED sTATEs PATENT oEEioE.

JOHN HARRIS, OF CLEVELAND, OHIO, ASSIGNOR TO CAROLINE A. HARRIS, OF CLEVELAND, OHIO.

BLOWPIPE To all whom it may concern:

lBe it known that I, JOHN HARRIS, a citii zen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio,liave invented a certain new and useful Improvement in Blowpipes, of which the following is a full, clear, and exact description, reference being had 4to the accompanying drawings.

This invention relates to burners of the blow-pipe t pe, and more especially to oxyaeety ene b ow pipes.

The general objects of the invention are to p`rovide a blow pipe in which oxygen and acetylene may be burned to produce a flame of intense heating capacity suitable for various purposes in the arts, such as so-called autogenous Welding, and which will admit of the employment of acetylene under a pressure greatly lower than has heretofore een considered practicable, without. any danger of lighting back" of the mixture within the blow pipe or within the acetylene supply conduit leading thereto.

A further object of the invention is to provide a blow pipe of this type which shall possess a wide range of ca acity, enabling it to satisfy the incidents oi) use which occur in the various arts in which such pipes may be ein loyed.

ith the foregoin general objects in view, the invention may e further and generally defined as consisting of the combinations of elements embodied in the claims hereto annexed and illustrated, in one modification,`

in the drawings formiiiig a. part hereof, wherein- .l

Figure 1 represents a central longitudinal sectional view of a blow pipe constructed in accordance with my invention, certain parts being shown in elevation; IFig. 2 represents a sectional detail corresponding to the line 2-2 of Fig. 1; and Figs. 3 and 4 ie resent res ectively a longitudinal sectiona view an a front elevation of a special form of tip which .may be employed with the blow pipe.

Describing by reference characters the parts shown in the drawings, 1 denotes the' )low pi e casing, the same comprising a hollow hody provided with a cylindrical hoi-c and threaded internally at its rear end l'or the reception pf a plug 2 and threaded cxternall at its front end for the reception of a nozz e 3. The casing 1 is provided with connections 4 and 5, preferably integral Specication of Letters Patent.

Application filed December 17, 1908.

Patented April 27, 1909.

Serial No. 468,052.

therewith, said connections being threaded for tlie `reception of the conduits 6 and 7 rcspectively. Connection 4 projects from the rear end of the casing 1 and communicates with a chamber formed in the rear portion of said casing immediately in front of the plug 2. Connection 5 projects from a portion of the easing 1 in front of connection 4i. The conduit 6 is provided with a valve 8 and Ais employed for the purpose of supplying oxygen under pressure to tbe chamber at the rear of the blow ipe casing. Conduit 7 is for the purpose oi) supplying acetylene to said casing and has therein means whereby the lighting back or propagation of flame is prevented, Without at the' same time unduly decreasing the sup ly of such gas to the burner. The acety ene supply conduit is provided with a valve 9.

The nozzle 3is provided with aconical 'bore 10 extending to the front or disch'ar e end thereof and has such front end preferab cylindrical in outline and provided. with an external' thread for the purpose of conven'- iently applying toand reinovin therefrom the tip 11. It will be observed t at the bore of tip 11 shown herein is considerably smaller than the discharge end of bore 10", such discharge end being of suflicient area to supply the maximum quantity of oxygen and a'cet lene for which the pipe is adapted. y substituting tips having larger or smaller bores than the one shown in tip 11, the' volurne of flame produced may be2/'correspond'- ingly varied without reference-tothe valves 8 and 9.

Withinthe bore of the casing 1 there is fittedv a plug 12, said plug being provided with a' cen'- tral bore 13 extending,therethrough. t its front end, the )lug 12 is provided with an' internally threaded recess to which there is removably itted a nozzle 14, lsaid nozzle being provided with a bore 15 communicating with the bore 13. For convenience of construction, bore 13 can be inad'e larger than' is riecessary under ordinary, conditions of use of the blow pipe, the effectivedischarge of 'ui'd through said bore being controlled by thel bore 15 and the valve 8. nozzle 14 is tapered or frusto-conical and forms, with the bore 10 of nozzl'e 3', a re'- stricted iassageway for acetylene into the mixing clianiber provided in the nozzle and' in the tip. Plug 12 is driven into the casing 1 and forms a tight fit therewith, the portion The front end of i of said plug which is interposed between the connections 4 and 5 serving to block communication between the oxygen in the chamber 16 at the rear of said plug and the acetylene supplied to said casing. lNhere the connection 5 merges with the casing, the plug is provided with an annular recess 17 between a pair of shoulders located on .opposite sides of said connection. That portion of the plug extending forwardly from the shoulder 18 is provided with a suitable number of narrow ongitudinal slots 19, communicating at one end with the recess 17 and at the other end withl the interior of the nozzle 3 and the mixing chamber. As will appear from Fig. 1, the recess 17 is of sufficient depth to provide suitable de th and capacity for the narrow slots 19. i s a plug having similar slots is employed in the acetylene supply pipe and is illustrated in detail herein, further reference to. the slots in the plug 12 is unnecessary at this time, as said slots will be described fully by a description of the slots in the latter plug.

The acetylene conduit comprises a casing 20 to the opposite ends of which are connected pipe connections communicating on the one land with the burner casing and on the other hand with the source of supply. Within the casing 20 there is closely fitted, as by means of a driving fit, a plug21. -This plug except as to length and diameter, is substantially identical with that portion of plug 12 extending from recess 17 to nozzle 3. The pipe connection extending from the blow pipe casing is detachably connected to the casing 20 by means of-a connection 22, which is threaded onto the adjacent ends of said casing and connection and forms a leak-proof between the pipe connection and the casing, a chamber 23 being provided within said connection 122 beyond the 'adjacent end of the plug 21.

The end of the pipe connection 7 projects into said chamber and abuts ragainst the plug 21 and such end is provided with a suitable number of apertures 24 within said chamber and establishing communication between said chamber and the pipe connection 7. A similar connection 25 is provided between the opposite end ofr the casing 20 and the supply p1 e connection 7 a communicating therewith. The plug 21 is provided with a series of slots 26 extending from end to end thereof, said slots pro'ecting radially inwardly from the outer su ace of said plug. These slots communicate at their opposite ends with the chambers formed in connections 22 and 25.

under a pressure oi from 5 set screw 27 which extends through the casing 1 and is threadedinto the plug.

In Figs. 3 and 4 I have shown a special form of tip which may be employed for the production of a short but wide and flat flame. rllhe tip, shown at 28, is provided with a longitudinal bore 29, which bore 'is ilared outwardly at its outer end, as shown at 30. This construction of tip provides a shorter flame than does a tip such as shown in Fig. l, with a largenheating surface.

ln operation, the oxygen and acetylene are A very important feature of ary-invention is that, by the slot construction shown herein,

a large aggregate area of acetylene supply is C ual provided, but the restriction .at indivi points by means of the slots will effectively )revent the propagation of liame or lighting ack, even when operating under )ressures of acetylene much lower than it as been considered heretofore profitable to employ. For instance, i am enabled to employ with the type of blow ipe shown herein acetylene under pressures rom 25/10 up` and oxygen ounds down. Furthermore, the peripheral discharge of the acetylene into the interiorA oi nozzle 3 supplies it kto the mixing chamber in an especially suitable condition to be acted upon by and -be conimingled with the oxygen.

complete and homogeneous mi'xtiure is discharged 'l'rom the pipe and perfect combustion is obtained at a temperature which will enable so-called autogenous welding to bc accomplished. Furthermore, owing to the large aggregate area provided ior the acetylene, i am enabled to obtain a larger flame and larger variations in flame than have heretofore been obtained by blow pipes of thisv character.

Having thus described my invention, what l. claim is:

1. In a blow pipe, the combination of a casing having therein a plug extending from the front to, the rear portion of the casing and forming with such rear portion of the casing a chamber, said lug havin a central bore extending theretirough an( having an annular. recess in the outer surface thereof between the rear and the front end thereof, a supply connection communicating with the part of said casing containing said recess, said plug being provided with a plurality of narrow slots extending from said recess to their-ont end thereof, and a nozzle carried by said casing and adapted to receive the i casing having a substantially cylindrical bore i end thereof, and a plug fitting said casingl fluids discharged through said'lbore and throu hsaid slots.

2. n a blow pipe, the combination of a extending from end to end' thereof, a nozzle carried by the front end of said casing, a plug for the rear portion of said casing, a gas supply connectlon carried by said casing near the rear portion thereof and in front of said plug, a second gas supply connection carried by said casing between the front and the rear closely and extending 'rearwardly between said connections and having a central bore therethrough and having adjacent to the lsecond connection an annular recess, said slots extending inwardly from the periphery thereof andrestricted in width to lprevent the passage of flame therethrough and said plug having a bore extending therethrough and through the ta ered nozzle thereof, the

front ends of said s ots communicating with the chamber in the first-mentioned nozzle, and a (pair of connections for said casing, one Vof sai connections communicating with the central bore of the lug and the other communicating with said slots.

4. A blow pipe comprising, in combination, a casing having at the front end thereof a nozzle, said nozzle having a tapered bore forming a chamber, a plug in said casing havingat its front end a recess, a nozzle fitted into said recess and projecting into the chamber, said plug being provided with a plurality of narrowradial slots extending inwardly from the periph ry thereof and restricted in width to prevent the passage of flame therethrough and said plug having a central bore extending 4therethrough and through 'the nozzle thereofj the front ends of said s ots communicating with the chamber inthe first-mentioned nozzle, and a air of connections for said casing, one of said connections communicating with the I,central bore of the plug and the other communicating with said slots.

5. Ablow pipe having, in combination, a casing, a mixmg chamber, a plug extendin lonv'itudinall of said casing and provide with 'a plurality of narrow lon 'tudmal slits communicating at one end wit 1 said casing and at the opposite end with said chamber and restricted in width to prevent the passage of flame therethrough,- means for supplying a gas through said slits to said mixing chamber', and a conduit for supplying ani other gas to' said chamber'.

l A 6. A blow pipe co'n'iprising in combination a casing having a nozzle provided with a tapered bore forming a chamber', a plug fitting said casing tightly and provided with a pluf rality of radial narrow longitudinal slits coinmunicating at one end with said chamber i and restricted in width to prevent the passage of flame therethrough, said plug having a tapered nozzle projecting centrally into the former nozzle, said plug being provided with a central bore or conduit extending therethrough and through the latter nozzle, and connections for supplying a gas through the bore of said plug and for supplying a second 7. A blow pipe comprising in combination a casing having a nozzle provided with a tapered bore forming`a chamber, said nozzle aving an externally threaded end, a plug in said casing rovided with a plurality of narrow lon ituginal slits communicating at one end wit said nozzle and itself havin a tapered nozzle projecting centrally into t e former nozzle, said plug being provided with a through the latter nozzle, connections for 'supplying a gas through the bore of said plug and for supplying a second gas through the. longitudinal slots thereof, and atip threaded onto the threaded end of the first-mentioned nozzle. l

8. The combination,l with a burner having a discharge outlet, of a gas su plying conduit communicatin `with said outlet; said conduit comprisin a ug fitted closely within a casing, said p ug eing provided with a plurality of narrow radial longitudinal slits extending from end t0l end thereof and pro'ectinginwardly from the eriphery of sai plug and restricted in widt to prevent the passage of flame therethrough. i

9. The combination of a blow-pipe casingl having a fluid fuel conduit therein, said conduit comprising a member in said casing having a plurality of longitudinal slots therein, said slots being of a width not exceeding the thickness of 34-ga e metal, and means forsupplying gas throu 1 the slots in said member.

10. The combination, with a burner having a discharge outlet, of a fluid'fuel conduit communicating with said outlet, said conduit comprising a member having a plurality of longltudinal slots therein for the passage of gas, said slots being of a width not exceeding the thickness of 34 gage metal.

11. The combination, with a burner, of a fluid fuel conduit, said conduit comprisimr a casing having fitted closely thereinto a pljug and said plug bein provided with a plurality of narrow longitudinal slots extending from end to end thereof and projectinor inwardly from the outer periphery of s'aid plug toward gas through the longitudinal slots thereof.

bore or conduit-extending therethrough and n saone@ the center thereof, a pipe pro'eeting into said ries of narrow longitudinal slots projeetin casing at each end thereol and abutting inwardly from the outer periphe thereo against the adjacent end of the plug and havand a supply conduit for the secon as coming one or more perforations in its wall, and munieating with said easing and inc uding a 5 connections between each of said pipes and casing having therein aplu fitting the latter 20 the adjacent end ofsaid casing, each of said casing tightly and provide With narrow lonconnections providing With the y easing a gitudinal slots projectlng inwardly from the chamber inelo'sing the erforation or perfoouter periphery thereof. l rations in the Wall of t e inolosed pipe. In testimony whereof, I hereunto afx my 1o 12. A blow-pipe corn rising, in colmbinasignature in the presence of' two witnesses. 25

tion, ay easing having a ischar e ont et nozzle, means for supplying a gas tgo said nozzle, JGHN HARRIS' -and means for supplying a second gas to said Witnesses:

nozzle, the latter means comprising a plug J. B. HULL,

15 fitting closely in said casing and having a sei BRENNAN B. WEST.

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